Pure Oxy-Fuel Circulating Fluidized Bed Combustion by Controlling Adiabatic Flame Temperature Using Fuel Staging
(2017) Current Science — Vol. 113, n° 08, p. 1560 (2017)
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- Authors
Zayoud, Azd 
- Abstract
- In the present study, a new method is proposed for temperature controlling by combustion staging. Two combustion stages can be used with two stages of fuel feeding. A high stoichiometric ratio (SR) gimel > 1 is used at the first stage to mitigate adiabatic flame temperature (AFT) in case of high O2% in the oxidant. For validation, a series of experiments are conducted using mini-CFB (circulating fluidized bed), and an oxidant of 100% O-2 concentration is used with three SR ratios, i.e. SR = 1.25, 2.0 and 3.0. The resulting average temperatures along the riser for biomass are 1031 degrees C, 950 degrees C and 798 degrees C; and for coal 1129 degrees C, 1051 degrees C and 961 degrees C respectively. The controlling of AFT with pure oxy-fuel combustion eliminates the recycled flue gas in oxy-fuel CFB combustion and flue gas recirculation section; this simplifies design, fabrication and installing-operating costs of the power plants. Familiarizing this concept can accelerate adapting oxy-fuel combustion in CFB power plants for carbon capturing and sequestration. This study can help commercialize the third generation of oxy-fuel CFB combustion with zero RFG. Finally, the concept of controlling AFT by SR is validated experimentally.
- Affiliations
Indian Institute of Technology Guwahati
Citations
Zayoud, A., Mahanta, P., & Saha, U. K. (2017). Pure Oxy-Fuel Circulating Fluidized Bed Combustion by Controlling Adiabatic Flame Temperature Using Fuel Staging. Current Science, 113(08), 1560. https://doi.org/10.18520/cs/v113/i08/1560-1567 (Original work published 2017)